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Gaseous Gaseous |
Breathing Gas transport Cellular |
exchange at exchange at |
by blood Respiration |
lungs level tissue level |
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Air movement into Exchange of gases Transport of Exchanging of Using oxygen in |
and out of lungs between alveoli oxygen from blood oxygen from blood cell processes to |
and blood capillaries of alveoli into the cells and produce carbon |
to body cells and carbon dioxide from dioxide and water, |
return of carbon cells into the blood releasing energy to |
dioxide be used for life |
processes |
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26 X Class Respiration - The energy releasing system |
Breathing |
In the previous classes we did experiments to find |
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A |
out what was there in the air we breathe out. |
We had seen that in a set up with lime water, it turned |
milky white fast as we breathe out into it as compared to |
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AN |
a similar set up in which normal air was passed with the |
help of a syringe or pichkari in lime water. (Experimental |
set up to test the presence of Carbondioxide in exhaled |
lime water |
air). Arrange apparatus as shown in figure-3 and try to do |
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NG |
the experiment once again to find out what happens. water |
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What does this experiment indicate? fig-3: Respiratory gases |
Which gas turns lime water milky? |
Which gas do you think might be present in greater quantities in |
the air we breathe out as compared to air around us? |
LA |
We are also aware of the fact that water vapour deposits on a mir- |
ror if we breathe out on it. |
Where does this water vapour come from in exhaled air? |
We shall have to study the pathway of air in our body through our |
TE |
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respiratory system and the mechanism of breathing in respiration to find |
out how the exhaled air comes out. By “respiratory system” we usually |
mean the passages that transport air to the lungs and to the microscopic |
air sacs in them, called alveoli (where gases are exchanged between them |
and blood vessels) and vice versa. |
T |
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Pathway of air |
Let us observe the pathway of air from nostril to alveolus. |
ER |
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nasal cavity |
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nostril |
pharynx epiglottis |
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larynx |
trachea |
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bronchi capillaries in which O2 and |
bronchioles CO2 exchanges occur |
alveoli |
lung |
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fig-4: Respiratory system of man |
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Free distribution by T.S. Government 2019-20 27 |
Nostrils: Air usually enters the body through the nostrils |
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